The extrinsic conductivity of SrCl2 crystals doped with Na+, K+ or Rb+ is interpreted by the Lidiard-Debye-Hückel theory, taking into consideration the presence of monovalent ions in interstitial positions. For SrCl2 : Na+ we calculate the Gibbs free energy of solubility. The study of SrCl2 : Gd3+ crystals gives the value of the mobility enthalpy of the interstitial chlorine
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